Isn't this normal with every new console release? Investors always have doubts about a new console and besides if the stock is going down because of sales then is pretty stupid imo. The Wii U have sold pretty well (Europe aside), and it's better than the PS3 and 360 launch.

A number of factors. Strong Yen, Nintendo's first anual loss ever. The US "fiscal cliff" and the Japanese election are not helping matters. Markets were skeptical on the WiiU reveal. Now is an Amazing time to buy Nintendo stock, if you're into making lots of money.